Table of Contents
Advertisement
Fault code No.
Item
1
Connection of Yamaha diagnos-
tic tool coupler.
Check the locking condition of
the coupler.
Disconnect the coupler and
check it (bent or broken termi-
nals and locking condition).
2
Connection of wire harness
ECU coupler.
Check the locking condition of
the coupler.
Disconnect the coupler and
check the pins (bent or broken
terminals and locking condition
of the pins).
3
Wire harness continuity.
4
Defective Yamaha diagnostic
tool.
5
Malfunction in ECU.
Er-4 (Yamaha diagnostic tool)
ECU (engine control unit) internal malfunction (input signal error):
no normal signals are received from the Yamaha diagnostic tool.
Improperly connected → Con-
nect the coupler securely or re-
place the wire harness.
Improperly connected → Con-
nect the coupler securely or re-
place the wire harness.
Open or short circuit → Replace
the wire harness.
Between ECU coupler and
Yamaha diagnostic tool coupler.
yellow/blue–yellow/blue
Between Yamaha diagnostic
tool coupler and meter assem-
bly coupler.
yellow/blue–yellow/blue
Replace the Yamaha diagnostic
tool.
Replace the ECU.
Refer to "REPLACING THE
ECU (engine control unit)" on
page 8-81.
8-68
FUEL INJECTION SYSTEM
Connect the Yamaha diagnostic
tool and turn the main switch to
"ON".
Fault code number is not dis-
played → Service is finished.
Fault code number is displayed
→ Go to item 2.
Connect the Yamaha diagnostic
tool and turn the main switch to
"ON".
Fault code number is not dis-
played → Service is finished.
Fault code number is displayed
→ Go to item 3.
Connect the Yamaha diagnostic
tool and turn the main switch to
"ON".
Fault code number is not dis-
played → Service is finished.
Fault code number is displayed
→ Go to item 4.
Connect the Yamaha diagnostic
tool and turn the main switch to
"ON".
Fault code number is not dis-
played → Service is finished.
Fault code number is displayed
→ Go to item 5.
Advertisement
Table of Contents
Troubleshooting
